Yeah I feel like webcomic covers, like those on Tapas and Webtoon are just so, so different from book covers out of a bookstore. I love bookstore covers that have neat design on them (LOVE the annhiliation series ones and how they're so punchy)
Like these books are a good time, but I picked em up from the library because the cover is awesome. I feel like printed publishing just gets to have a wild time with graphic design.
As for Tapas and Webtoon covers...they're fine. A lot of them look similar because you kind of have to with how much space we have provided (when people see em, they're pretty small on the phone), I haven't really seen anything that was like "oh neat! so arty!" It generally is "here's my characters, you get the drift!"